Earlier quoted context omitted.
> If we put ethnicity ahead of national origin America can’t claim anything to its name. Period. It's silly to put ethnicity ahead of national origin, though, since one of America's biggest qualities it that it is a melting pot. This feels like saying "If we put learning curve ahead of type safety Haskell can't claim anything to its name. Period." It's true, but kinda vacuous.
But that particular super-famous German who lived in Princeton, NJ is also recognized as a German physicist. To say he was already quite accomplished when he left Europe would be an understatement. Personally, I think if an immigrant of descendant of immigrants invents something prominent, it is fair for both countries to be proud of the accomplishment, and share that enthusiasm. It doesn't, or shouldn't hurt anyone.…
Depending on the reasons for emigration, it might be fair to replace most of that pride with "dann, could have been 'ours'".